Method for producing a body part of a vehicle and body part of a vehicle

ABSTRACT

A method is provided for producing a body part of a vehicle. The method includes, but is not limited to providing a first profile part with at least one first welding flange and with a first opening as well as a second profile part with at least one third welding flange. The welding flange is at least partially arranged on the third welding flange subject to the formation of an at least partially closed form of the body part. The first welding flange and the third welding flange are arranged within the at least partially closed form. A first laser beam is guided through the first opening onto the first welding flange subject to the formation of at least one first laser weld seam between the first welding flange and the third welding flange.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority to German Patent Application No.102009016220.8, filed Apr. 3, 2009, which is incorporated herein byreference in its entirety.

TECHNICAL FIELD

The invention relates to a method for producing a body part of a vehicleas well as a body part of a vehicle.

BACKGROUND

From JP 2003054445 A, a body part with at least one welding flangelocated inside is known, upon whose production two profile parts arejoined together through a laser welding method. There, a laser beam isguided on an outer lateral surface along the at least one weldingflange.

At least one object of the invention is to state a method for producinga body part of a vehicle which makes possible a reliable weldedconnection, wherein additionally a weight reduction of the body part isto be achieved. In addition, other objects, desirable features, andcharacteristics will become apparent from the subsequent summary anddetailed description, and the appended claims, taken in conjunction withthe accompanying drawings and this background.

SUMMARY

According to an embodiment of the invention, a method for producing abody part of a vehicle is stated, wherein the method comprises thefollowing steps. A first profile part with at least one first weldingflange and with a first opening as well as a second profile part with atleast a third welding flange are provided. The first welding flange isat least partially arranged on the third welding flange subject to theformation of an at least partially closed form of the body part. There,the first welding flange and the third welding flange are arrangedwithin the at least partially closed form. A first laser beam is guidedthrough the first opening onto the first welding flange subject to theformation of at least one first laser weld seam between the firstwelding flange and the third welding flange.

The method has the advantage that it guarantees a secure connection ofthe first and the second profile part through the first laser weld seam.In addition, this method, compared with conventional welding techniquessuch as for example electrode welding, is almost maintenance-free andadditionally also faster, as a result of which production costs arereduced. In addition, the widths of the welding flange or the weldingflanges can be reduced which leads to a weight reduction of the bodypart and, connected with this, lower fuel consumption as well as lowerexhaust gas emission, such as for example carbon dioxide. In addition tothis, profile parts whose welding flanges have different thicknessesand/or wherein the respective welding flange has a variable thickness,for example jumps in thickness, can be welded together through themethod according to the invention. This is an advantage especially whentailored blanks are employed as profile parts. There, the variablethickness can be taken into account through a corresponding variation ofthe laser output.

In an embodiment of the method according to the invention the firstprofile part comprises at least one additional opening.

Through the at least one additional opening the first laser beam in aconfiguration of the method is guided onto the first welding flangesubject to the formation of at least one second laser weld seam betweenthe first welding flange and the third welding flange. This additionallyincreases the reliability of the welded connection, since in addition tothe first laser weld seam a second laser weld seam is created.

Here, the first laser beam is preferably operated pulsed and, betweenthe guiding through the first opening and the guiding through the atleast one additional opening, interrupted.

In addition to this, the first laser beam, during the guiding throughthe first opening and/or the guiding through the at least one additionalopening, can be interrupted.

An interruption of the laser beam has the advantage that as a result theheating of the welding flange or the welding flanges connected with thewelding process can be reduced. This in turn leads to quicker coolingdown of the welding flange or the welding flanges and thus an altogetherreduced method duration.

In an alternative embodiment of the method according to the invention asecond laser beam is guided through the at least one additional openingonto the first welding flange subject to the formation of at least onesecond laser weld seam between the first welding flange and the thirdwelding flange. The first laser beam and the second laser beam can beguided simultaneously. This leads to a further reduction of theproduction duration.

Preferably the at least one first laser weld seam and the at least onesecond laser weld seam are formed overlapping each other. Thisembodiment has the advantage of further increased reliability of thewelded connection and thus increased stability of the body part, whichmore preferably in accident situations, improves the protection of thevehicle occupants. In addition, a continuous or overlapping laser weldseam protects the body part from entering water, for example rain wateror dirt and thus makes possible sealing of the body part withoutadditional sealing compound, for example in form of a sealing rubber,being required. This leads to a reduction of the required components anda weight reduction, as a result of which the production costs, the fuelconsumption and the exhaust gas emission can be lowered.

In a further embodiment of the method the first profile part comprisesat least one second welding flange and the second profile part at leastone fourth welding flange. The second welding flange and the fourthwelding flange are arranged within the at least partially closed form.Here, the second welding flange is arranged at least partially on thefourth welding flange. A third laser beam is guided through the at leastone additional opening onto the second welding flange subject to theformation of at least one third laser weld seam between the secondwelding flange and the fourth welding flange. Through the provision ofthe second and the fourth welding flange and the formation of the thirdlaser weld seam between the second welding flange and the fourth weldingflange the connection of the two profile parts can be additionallyimproved. Preferably the second and the fourth welding flange arelocated within the at least partially closed form on an opposite sidewith respect to the first and third welding flange.

In addition, the first welding flange and the second welding flange arepreferably located in an end region of the first profile part as well asthe third welding flange and the fourth welding flange in an end regionof the second profile part.

The third laser beam can be simultaneously guided with the first laserbeam and/or the second laser beam.

In an embodiment the first laser beam and/or the second laser beam areguided in a straight line onto the first welding flange and/or the thirdlaser beam is guided in a straight line onto the second welding flange.This embodiment has the advantage of a simple method sequence and thus alower number of components required to carry out the method.

In a further embodiment the first laser beam and/or the second laserbeam are guided onto the first welding flange by means of a deflectiondevice and/or the third laser beam is guided onto the second weldingflange by means of a deflection device. Although this increases thequantity of the components required to carry out the method, the lengthof the respective laser weld seams with identical size of the openingscan however be increased or the width of the openings with identicallength of the laser weld seams can be reduced accordingly as a result.

Preferably the at least one deflection device comprises a mirror. Here,the at least one deflection device can be arranged within the at leastpartially closed form.

In an embodiment of the method the first welding flange and the thirdwelding flange are deformed before the arranging of the first weldingflange on the third welding flange subject to the formation of aU-shaped profile each. Because of this, a contact surface can bereliably provided between the two welding flanges. The correspondinglaser beams are subsequently guided in the region of this contactsurface, as a result of which a further improved welded connectionbetween the first welding flange and the third welding flange is madepossible.

In addition to this, the second welding flange and the fourth weldingflange before the arranging of the second welding flange on the fourthwelding flange can be deformed subject to the formation of a U-shapedprofile each, as a result of which a contact surface can likewise bereliably provided between the two welding flanges.

The position of the first opening and the at least one additionalopening in the first profile part can be determined by means of a methodwhich establishes the strength of the body part.

In addition, the first opening and the at least one additional openingcan also be produced in the first profile part only following thearranging of the first welding flange on the third welding flange.

In a further configuration of the method the second profile part has atleast one opening through which a fourth laser beam is guided onto thethird welding flange subject to the formation of at least one fourthlaser weld seam between the first welding flange and the third weldingflange. In addition to this, the second profile part can have at leastone additional opening through which a fifth laser beam is guided ontothe fourth welding flange subject to the formation of at least a fifthlaser weld seam between the second welding flange and the fourth weldingflange.

The first laser weld seam and/or the additional laser weld seams, morepreferably the second, third and/or fourth laser weld seam, can beembodied in a straight line.

It is also possible that the first laser weld seam and/or the additionallaser weld seams, more preferably the second, third and/or the fourthlaser weld seam are embodied curved or bent.

Through a suitable selection of the form of the laser weld seams theenergy input in the respective welding flanges or the respective profileparts connected with the welding process can be advantageously reducedor input in such a controlled manner that the heating of the weldingflanges or profile parts takes place preferably homogenously. Because ofthis, temperature-dependent mechanical stresses within the weldingflanges are reduced or buckling of the welding flanges or of parts ofthe welding flanges connected with the heating is reduced. This lowersthe risk of the development of distortions during the subsequentcooling-down of the welding flanges or of the profile parts, morepreferably since the cooling-down takes place more homogenously ordistributed more evenly. Here it is also conceivable that the respectivelaser beams are guided in such a manner that they partially do not formany laser weld seams but merely heat the welding flanges concernedlocally in order to achieve as homogenous a temperature distributionwithin the welding flanges as possible.

The embodiments of invention additionally relate to a body part of avehicle, wherein the body part is produced through one of the methodsdescribed above.

A corresponding body part thus comprises at least one first profile partand one second profile part. The first profile part comprises at leastone first welding flange and the second profile part comprises at leastone third welding flange which is at least partially arranged on thefirst welding flange. The body part has an at least partially closedform and the first welding flange and the third welding flange arearranged within the at least partially closed form. At least the firstprofile part comprises at least one opening and the first welding flangeand the third welding flange are connected to each other through atleast one first laser weld seam.

As already explained above, such a body part has a reduced weight whichhas an advantageous effect on the fuel consumption and the exhaust gasemission.

Here, the vehicle can be a motor vehicle and the first profile partand/or the second profile part a part of an A-pillar of the motorvehicle. This makes possible integration of the at least partiallyclosed body part, for example in form of an A-pillar half shell, in aside wall of the motor vehicle, as a result of which the joining andtool costs are lowered and the production expenditure reduced.

In an alternative embodiment the first profile part and/or the secondprofile part is a part of a C or D-pillar of the motor vehicle.

The method and the body part cannot only be provided in motor vehicleproduction but for example also in the field of ship or aircraftconstruction. In general, the method and the body part are particularlysuitable for light-weight construction.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will hereinafter be described in conjunction withthe following drawing figures, wherein like numerals denote likeelements, and.

FIG. 1 shows a method for producing a body part of a vehicle accordingto a first embodiment of the invention;

FIG. 2 shows a method for producing a body part of a vehicle accordingto a second embodiment of the invention;

FIG. 3 shows a method for producing a body part of a vehicle accordingto a third embodiment of the invention;

FIG. 4 shows a method for producing a body part of a vehicle accordingto a fourth embodiment of the invention;

FIG. 5 a shows a first form of a laser weld seam; and

FIG. 5 b shows a second form of a laser weld seam;

DETAILED DESCRIPTION

The following detailed description is merely exemplary in nature and isnot intended to limit application and uses. Furthermore, there is nointention to be bound by any theory presented in the precedingbackground or summary or the following detailed description.

FIG. 1 shows a method for producing a body part 1 of a vehicle accordingto a first embodiment of the invention.

To produce the body part 1 a first profile part 2 and a second profilepart 5 are provided. The first profile part 2 comprises a first opening4 as well as additional openings, 9, 10, 11, 12 and 13. In addition, thefirst profile part 2 comprises a first welding flange 3 as well as asecond welding flange 20. The second profile part 5 comprises a thirdwelding flange 6 and a fourth welding flange 21.

The first welding flange 3 is arranged on the third welding flange 6. Inaddition, the second welding flange 20 is arranged on the fourth weldingflange 21. In the embodiment shown in FIG. 1 the first welding flange 3is arranged completely on the third welding flange 6 and the secondwelding flange 20 is arranged completely on the fourth welding flange21. However, it is also possible to arrange the first welding flange 3only partially on the third welding flange 6 and/or the second weldingflange 20 only partially on the fourth welding flange 21.

The first profile part 2 and the second profile part 5 are arranged insuch a manner that a partially closed form of the body part 1 is formed.The first welding flange 3, the second welding flange 20, the thirdwelding flange 6 as well as the fourth welding flange 21 are arrangedwithin the at least partially closed form.

A first laser beam 7 is guided through the first opening 4 of the firstprofile part 2 as shown in FIG. 1. Here, the first laser beam 7 sweepsan angle α and a first laser weld seam 8 is formed between the firstwelding flange 3 and the third welding flange 6.

Following this, the first laser beam 7 is guided through the additionalopening 9 subject to the formation of a second laser weld seam 14between the first welding flange 3 and the third welding flange 6. Afterthis, the first laser beam 7 is guided through the opening 10 subject tothe formation of a laser weld seam 15 between the first welding flange 3and the third welding flange 6.

The first laser beam 7 is thus successively guided through the firstopening 4, the additional opening 9 and the opening 10. The first laserbeam 7 is operated in a pulsed manner and between the guiding throughthe first opening 4 and the guiding through the additional opening 9 aswell as the opening 10, interrupted.

In the embodiment shown, the first laser weld seam 8 as well as thesecond laser weld seam 14 and the laser weld seam 15 are arrangedseparately or offset from one another. This makes possible reducedenergy input in the welding flanges 3 and 6 during the weldingoperation, a result of which temperature-dependent mechanical stresseswithin the mentioned welding flanges can be controlled or reduced.However, it is also possible that the first laser weld seam 8 and thesecond laser weld seam 14 as well as the laser weld seam 15 are embodiedoverlapping one another. In this case, laser weld seams 8,14 and 15embodied overlapping one another, protect the body part 1 against theentry of water, for example, of rain water, or dirt and make possiblesealing of the body part 1 without additional sealing compound, forexample in form of a sealing rubber, being required.

A third laser beam 22 is guided through the opening 11 onto the secondwelding flange 20 subject to the formation of a third laser weld seam 16between the second welding flange 20 and the fourth welding flange 21.Following this, the third laser beam 22 is guided through the opening 12onto the second welding flange 20 subject to the formation of a laserweld seam 17 between the second welding flange 20 and the fourth weldingflange 21. Following this, the third laser beam 22 is guided through theopening 13 subject to the formation of a laser weld seam 18 between thesecond welding flange 20 and the fourth welding flange 21.

Like the first laser beam 7 before, the third laser beam 22 is likewiseoperated in a pulsed manner and between the guiding through the opening11 and the opening 12 as well as through the opening 13, interrupted.

In the embodiment shown, the third laser weld seam 16 and the laser weld17 as well as the laser weld seam 18 are arranged separated from oneanother. However, it is also possible that the third laser weld seam 16as well as the laser weld 17 and the laser weld seam 18 are formedoverlapping one another.

The first laser beam 7 and the third laser beam 22 can be generated bythe same laser source, wherein initially the first laser beam 7 isguided through the first opening 4 and the additional opening 9 and theopening 10 and following this the third laser beam 22 is guided throughthe opening 11 and the openings 12 and 13. It is however also possiblethat the first laser beam 7 is generated by a first laser source and thethird laser beam 22 by a third laser source and are each guided at thesame time.

The first laser beam 7 in the embodiment shown is guided in a straightline onto the first welding flange 3. In addition, the third laser beam22 is guided in a straight line onto the second welding flange. In analternative embodiment the mentioned laser beams are guided onto thecorresponding welding flanges by means of at least one deflectiondevice. The deflection device can comprise a mirror and be arrangedwithin the at least partially closed form.

The first laser weld seam 8, the second laser weld seam 14 and the thirdlaser weld seam 16, as well as the additional weld seams 15, 17 and 18are formed in a straight line in the embodiment shown. In an alternativeembodiment of the method, the respective laser beams can also be guidedonto the first welding flange 3 and the second welding flange 20 in sucha manner that the corresponding laser weld seams have a bent or curvedform.

The second profile part 5 in the embodiment shown in FIG. 1 likewisecomprises openings 26, 27 and 28. Through at least one of the openings26, 27 and 28, an additional laser beam not shown in FIG. 1 for the sakeof clarity can be guided onto the third welding flange 6 subject to theformation of at least one additional laser weld seam between the firstwelding flange 3 and the third welding flange 6.

In FIG. 1, the first laser beam 7 and the third laser beam 22 are shownmore than once to simplify representation. It is, however, the samelaser beam 7 which, as explained, is successively guided through thefirst opening 4 as well as the additional opening 9 and the opening 10or the same laser beam 22 which is successively guided through theopening 11 as well as the opening 12 and the opening 13.

FIG. 2 shows a method for producing a body part 1 of a vehicle accordingto a second embodiment of the invention. Components with the samefunctions as in FIG. 1 are marked with the same reference characters andare not explained in more detail in the following.

In this embodiment of the invention the first laser beam 7 in turn isguided through the first opening 4 onto the first welding flange 3subject to the formation of the first laser weld seam 8 between thefirst welding flange 3 and the third welding flange 6. At the same timethis is happening, a second laser beam 19 is guided through theadditional opening 9 onto the first welding flange 3 subject to theformation of a second laser weld seam 14 between the first weldingflange 3 and the third welding flange 6. Also at the same time, a laserbeam 23 is guided through the opening 10 onto the first welding flange,wherein a laser weld seam 15 forms between the first welding flange 3and the third welding flange 6.

In the embodiment shown, the first laser weld seam 8 as well as thesecond laser weld seam 14 and the laser weld seam 15 are arrangedseparated or offset from one another. This allows reduced energy inputin the welding flanges 3 and 6 during the welding operation, as a resultof which temperature-dependent mechanical stresses within the mentionedwelding flanges can be controlled or reduced. However, it is alsopossible to embody the first laser weld seam 8 as well as the secondlaser weld seam 14 and the laser weld seam 15 overlapping one another.In this case, laser weld seams 8, 14 and 15 formed in a manneroverlapping one another protect the body part 1 against entry of water,for example rain water, or dirt and make possible sealing of the bodypart 1 without additional sealing compound for example in form of asealing rubber being required.

In addition to this, the third laser beam 22 is guided through theopening 11 onto the second welding flange 20 subject to the formation ofthe third laser weld seam 16 between the second welding flange 20 andthe fourth welding flange 21. At the same time this is happening, alaser beam 24 is guided through the opening 12 and a laser beam 25 isguided through the opening 13 onto the second welding flange 20 subjectto the formation of a laser weld seam 17 and 18 between the secondwelding flange 20 and the fourth welding flange 21.

The first laser beam 7 as well as the second laser beam 19 and the laserbeam 23 in this case can be guided at the same time as the third laserbeam 22 and the laser beams 24 and 25.

In the embodiments shown in FIG. 2 the third laser weld seam 16 isarranged separated from the laser weld seam 17 and the laser weld seam18. It is however also possible to embody the third laser weld seam 16and the laser weld seam 17 as well as the laser weld seam 18 in a manneroverlapping one another.

The first laser beam 7 as well as the second laser beam 19 and the laserbeam 23 in the embodiment shown are guided onto the first welding flange3 in a straight line. In addition, the third laser beam 22 as well asthe laser beams 24 and 25 are guided onto the second welding flange 20in a straight line. In an alternative embodiment the mentioned laserbeams are guided onto the corresponding welding flanges by means of atleast one deflection device. The deflection device can comprise a mirrorand be arranged within the at least partially closed form.

In the embodiment shown, the first laser weld seam 8, the second laserweld seam 14 and the third laser weld seam 16 as well as the additionalweld seams 15, 17 and 18 are formed in a straight line. In analternative embodiment of the method, the respective laser beams canalso be guided onto the first welding flange 3 and the second weldingflange 20 in such a manner that the corresponding laser weld seams havea bent or curved form.

The second profile part 5 in the embodiment shown in FIG. 2 likewisecomprises openings 26, 27 and 28. Through at least one of the openings26, 27 and 28 an additional laser beam, which is not shown in FIG. 2 forthe sake of clarity, can be guided onto the third welding flange 6subject to the formation of at least one additional laser weld seambetween the first welding flange 3 and the third welding flange 6.

The body parts 1 shown in FIG. 1 and FIG. 2 are more preferably suitablefor installation in a motor vehicle, wherein the first profile part 2and/or the second profile part 5 can be a part of an A-pillar of themotor vehicle. Alternatively, the first profile part 2 and/or the secondprofile part 5 can be a part of a C or D-pillar of the motor vehicle.

FIG. 3 shows a method for producing a body part 30 of a vehicleaccording to a third embodiment of the invention. Components with thesame functions as in the preceding figures are marked with the samereference characters and are not explained in more detail in thefollowing.

The method according to the third embodiment is similar to the firstembodiment shown in FIG. 1, wherein in contrast with the embodimentshown in FIG. 1, a flange 29 in form of a plate or plate strip isadditionally arranged between the first welding flange 3 and the thirdwelding flange 6. The flange 29 on executing the welding operation islikewise welded together, i.e. the first laser weld seam 8 and thesecond laser weld seam 14 and the laser weld seam 15 form between thefirst welding flange 3, the third welding flange 6 and the flange 29.

The flange 29 serves as mounting flange for a seal not shown in FIG. 3for example in form of a sealing rubber for sealing the body part 30against the entry of water and dirt.

In an alternative embodiment which is not shown at least one of theprofile parts 2 and 5 instead of the separate flange 29 can have aone-sided lateral projection for example in form of a side wall. Thislateral projection in turn serves as mounting flange for a seal.

FIG. 4 shows a method for producing a body part 30 of a vehicleaccording to a fourth embodiment of the invention. Components with thesame functions as in the preceding figures are marked with the samereference characters and are not explained in more detail in thefollowing.

The method according to the fourth embodiment is similar to the secondembodiment shown in FIG. 2, wherein in contrast with the secondembodiment shown in FIG. 2 a flange 29 in form of a plate or plate stripis additionally arranged between the first welding flange 3 and thethird welding flange 6. During the welding operation the flange 29 islikewise welded, i.e. the first laser weld seam 8 and the second laserweld seam 14 and the laser weld seam 15 form between the first weldingflange 3, the third welding flange 6 and the flange 29.

The flange 29 serves as mounting flange for a seal not shown in FIG. 4,for example, in form of a sealing rubber, for sealing the body partsagainst the entry of water and dirt.

In an alternative embodiment which is not shown at least one of theprofile parts 2 and 5 instead of the separate flange 29 can comprise aone-sided lateral projection, for example in form of a side wall. Thislateral projection, in turn serves as mounting flange for a seal.

FIG. 5A shows a first form of a laser weld seam. Components with thesame functions as in the preceding figures are marked with the samereference characters and are not explained in more detail in thefollowing.

To this, FIG. 5A shows a part region of the first welding flange 3 aswell as the first laser weld seam 8 and the second laser weld seam 14.The first laser weld seam 8 and the second laser weld seam 14 arearranged separated from each other and each have a curved, partiallyintertwined form.

FIG. 5B shows a second form of a laser weld seam. Components with thesame function as in the preceding figures are marked with the samereference characters and are not explained in more detail in thefollowing.

To this, FIG. 5B shows a part region of the first welding flange 3 aswell as the first laser weld seam 8, the second laser weld seam 14 andthe laser weld seam 15. The first laser weld seam 8, the second laserweld seam 14 and the laser weld seam 15 are arranged separated from oneanother and each has a bent, wave-like form.

The additional laser weld seams not shown in FIG. 5A and FIG. 5B canalso have the forms shown in the two figures.

Through suitable selection of the form of the laser weld seams theenergy input in the respective welding flanges or the respective profileparts connected with the welding operation can be advantageously reducedor introduced in a controlled manner such that the heating of thewelding flanges or profile parts takes place as homogenously aspossible. Because of this, temperature-dependent mechanical stresseswithin the welding flanges are reduced or buckling of the weldingflanges or of parts of the welding flanges connected with the heating isreduced.

While at least one exemplary embodiment has been presented in theforegoing summary and detailed description, it should be appreciatedthat a vast number of variations exist. It should also be appreciatedthat the exemplary embodiment or exemplary embodiments are onlyexamples, and are not intended to limit the scope, applicability, orconfiguration in any way. Rather, the foregoing summary and detaileddescription will provide those skilled in the art with a convenient roadmap for implementing an exemplary embodiment, it being understood thatvarious changes may be made in the function and arrangement of elementsdescribed in an exemplary embodiment without departing from the scope asset forth in the appended claims and their legal equivalents.

1. A method for producing a body part of a vehicle, the methodcomprising the steps of: providing a first profile part with at leastone first welding flange and a first opening; providing a second profilepart with at least one third welding flange; arranging of the at leastone first welding flange at least partially on the at least one thirdwelding flange subject to formation of an at least partially closed formof the body part, wherein the at least one first welding flange and theat least one third welding flange are arranged within the at leastpartially closed form; and guiding of a first laser beam through thefirst opening onto the at least one first welding flange subject to theformation of at least one first laser weld seam between the at least onefirst welding flange and the at least one third welding flange.
 2. Themethod according to claim 1, wherein the first profile part comprises atleast one additional opening.
 3. The method according to claim 2,wherein the first laser beam is guided through the at least oneadditional opening onto the at least one first welding flange subject tothe formation of at least one second laser weld seam between the atleast one first welding flange and the at least one third weldingflange.
 4. The method according to claim 3, wherein the first laser beamis pulsed and guided between the guiding through the first opening andthe guiding through the at least one additional opening the first laserbeam is interrupted.
 5. The method according to claim 2, wherein asecond laser beam is guided through the at least one additional openingonto the at least one first welding flange subject to the formation ofat least one second laser weld seam between the at least one firstwelding flange and the at least one third welding flange.
 6. The methodaccording to claim 5, wherein the first laser beam and the second laserbeam are guided at the same time.
 7. The method according to any one ofthe claims 3, wherein the at least first laser weld seam overlaps the atleast one second laser weld seam.
 8. The method according to claim 2,wherein the first profile part comprises an at least one second weldingflange and the second profile part comprises at least one fourth weldingflange and the at least one second welding flange and the at least onefourth welding flange are arranged within the at least partially closedform, wherein the at least one second welding flange is at leastpartially arranged on the at least one fourth welding flange and whereina third laser beam is guided through the at least one additional openingonto the at least one second welding flange subject to the formation ofat least one third laser weld seam between the at least one secondwelding flange and the at least one fourth welding flange.
 9. The methodaccording to claim 5, wherein at least one of the first laser beam orthe second laser beam is guided in a straight line.
 10. The methodaccording to claim 9, wherein at least one of the first laser beam orthe second laser beam is guided onto the at least one first weldingflange with at least one deflection device.
 11. The method according toclaim 10, wherein the at least one deflection device comprises a mirror.12. The method according to claim 10, wherein the at least onedeflection device is arranged within the at least partially closed form.13. The method according to claim 1, wherein prior to the arranging ofthe at least one first welding flange on the at least one third weldingflange, the at least one first welding flange and the at least one thirdwelding flange are deformed subject to the formation of a U-shapedprofile each.
 14. A body part of a vehicle, comprising: a first profilepart with at least one first welding flange and a first opening; asecond profile part with at least one third welding flange; wherein theat least one first welding flange is arranged at least partially on theat least one third welding flange subject to formation of an at leastpartially closed form of the body part, wherein the at least one firstwelding flange and the at least one third welding flange are arrangedwithin the at least partially closed form; and wherein the first openingis adapted to guide a first laser beam onto the at least one firstwelding flange subject to the formation of at least one first laser weldseam between the at least one first welding flange and the at least onethird welding flange.
 15. The body part according to claim 14, whereinthe vehicle is a motor vehicle and the first profile part is part of anA-pillar of the motor vehicle.
 16. The body part according to claim 14,wherein the vehicle is a motor vehicle and the second profile part ispart of an A-pillar of the motor vehicle.
 17. The body part according toclaim 14, wherein the first profile part comprises at least oneadditional opening.